Sink



FIG. 1 is a perspective view of a sink showing my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The broken-line disclosure in the views represents portions of thearticle in which the claimed design is embodied, but which form no partof the claimed design.

The ornamental design for a sink, as shown and described.